Engine - Cylinder Heads - LT4 Design Aluminum Cylinder Head

From GM Performance - This aluminum LT4 design head is the same as the 1996 production head except it has the LT1 rocker stud P/N 12552126 installed. This head has light weight 2.00 inch intake and 1.55 inch exhaust valves installed in this assembly. These heads can only be used on 1992 and later LT1 and LT4 engines. NOTE: This head assembly includes the following items, intake valve P/N 12555331, exhaust valve P/N 12551313, valve spring P/N 12551483, valve cap P/N 10212808, seal P/N 10212810, key P/N 24503856, stud P/N 12552126, and shim P/N 10212809.